Styryl dyestuffs

ABSTRACT

DYESTUFFS OF THE FORMULA   R1-O-A-(CO)M-O-B-N(-R)-(3-D-1,4-PHENYLENE)-CH=C(-Y)-CN   WHEREIN R1 IS ALKYL, ALKENYL, ARALKYL, ARYL, CYCLOALKYL, ACYL, OR CARBALKOXY; M IS 0 OR 1; A IS ARYL; B IS ALKYLENE HAVING 2 TO 4 CARBON ATOMS; R IS ALKYL, ARALKYL, OR CYCLOALKYL OR   R1-O-A-(CO)M-O-B-   D IS HYDROGEN, ALKYL, ALKOXY, OR HALOGEN; Y IS   -CN, -SO2-R2, -COO-R3, OR -CO-N(-R4)-R5   R4 AND R5 ARE HYDROGEN, ALKYL, ARALKYL, CYCLOALKYL, OR ARYL; AND R2 AND R3 ARE ALKYL, ARALKYL, CYCLOALKYL, OR ARYL. THE DYESTUFFS ARE FREE FROM SULPHONIC ACID AND CARBOXYLIC ACID GROUPS AND ARE USEFUL FOR DYEING CELLULOSE TRIACETATE, POLYAMIDE, POLYESTER, AND POLYURETHANES.

hired States 41 iatent 3,787,476 Patented Jan. 22, 1974 3,787,476 STYRYL DYESTUFFS Ernst-Heinrich Rohe and Roderich Raue, Leverkusen,

Germany, assignors to Bayer Akfiengesellschaft, Leverkusen, Germany No Drawing. Filed Jan. 6, 1966, Ser. No. 518,981 Claims priority, applicg fign 9Germany, Jan. 12, 1965,

Int. Cl. C07c 121/70 US. Cl. 260-465 D 6 Claims ABSTRACT OF THE DISCLOSURE Dyestuifs of the formula D R I GEN L I. wherein R is alkyl, alkenyl, aralkyl, aryl, cycloalkyl, acyl, or carbalkoxy; m is 0 or 1; A is aryl; B is alkylene having 2 to 4 carbon atoms; R is alkyl, aralkyl, or cycloalkyl or D is hydrogen, alkyl, alkoxy, or halogen; Y is CN, S0:Rz, -C 0 0 R3, or C ON R and R are hydrogen, alkyl, aralkyl, cycloalkyl, or aryl; and R and R are alkyl, aralkyl, cycloalkyl, or aryl. The dyestuffs are free from sulphonic acid and carboxylic acid groups and are useful for dyeing cellulose triacetate, polyamide, polyester, and polyurethanes.

The present invention is concerned with new valuable dyestuffs of the general formula RiOA C GEN L Lim in which R means an alkyl, alkenyl, aralkyl, aryl, cycloalkyl, acyl or carbalkoxy radical, m is the number 0 or 1, A is an aryl radical, B is an alkylene radical with 2 to 4 carbon atoms, R is an alkyl, aralkyl or cycloalkyl radical or the group Lei.

D stands for hydrogen, an alkyl or alkoxy radical or a halogen atom, Y for 4 CN, SO2R2, COOR: or -C ON the substituents R and R for hydrogen atoms, alkyl, aralkyl, cycloalkyl or aryl radicals, and R and R for alkyl, aralkyl, cycloalkyl or aryl radicals. The dyestuffs are free from sulphonic acid and carboxylic acid groups. The alkyl, aralkyl, cycloalkyl and aryl radicals contained in. the General Formula I may contain further non-ionic substituents such as chlorine, bromine, cyano, alkyl, aralkyl. aryl, carboxylic acid ester and possibly N-substituted carbonamide and sulphonamide groups.

The new dyestuffs can be prepared by reacting aldehydes of the general formula or functional derivatives thereof with methylene compounds of the general formula CN (III) wherein R, R A, B, D, Y and m have the above mean ing. The reaction is carried out at temperatures of 20 to C. in the presence or absence of an inert solvent. Suitable solvents are, for example, methanol, ethanol, dioxan, dimethyl formamide, dimethyl sulphoxide or chloroform. To accelerate the reaction, catalysts may be added, for example piperidine, triethylamine, diethylamine, basic ion-exchangers, potassium hydroxide, sodium alcoholate and potassium alcoholate.

The aldehydes of the Formula II are prepared from the corresponding amines of the general formula D R I Warner L .1 (IV) by known methods, for example according to the so-called Vilsmeier reaction, by reacting with phosphorus oxychloride or with phosgene and dimethyl formamide.

Compounds of the Formula IV in which m is 1 are obtained by the reaction of compounds of the general formula HOB (V) with compounds of the general formula 0 Rl0-Ai V (VI) N-methyl-N-hydroxy-ethylaniline, N-ethyl-N-hydroxy-ethylaniline, N-chloro-ethyl-N-hydroxy-ethylaniline, N-cyanoethyl-N-hydroxy-ethylaniline, N-butyl-N-hydroxy-ethylaniline, N-benzyl-N-hdroxy-ethylaniline, N-cyclohexyl-N-hydroxy-ethylaniline, 3-methyl-N-methyl-N-hydroxy-ethylaniline, 3-methyl-N-ethyl-N-hydroxy-ethyl-aniline, 3-methyl-N-butyl-N-hydroxy-ethyl-aniline, 3-ethyl-N-ethyl-N-hydroxy-ethyl-aniline, 3-methoxy-N-methyl-N-hydroxy-ethyl-aniline, 3-chloro-N-butyl-N-hydroxy-ethylaniline.

Suitable compounds of the Formula VI are, for example:

Compounds of the Formula IV are moreover obtainable by reacting substances of the general formula E -Q Hal-B with compounds of the general formula IhO-A-ii-O Me (VIII) for R O-A-0Me (IX) In these formulae, the radicals R, R D, A, B have the meaning given above, Hal preferably stands for chlorine and bromine and Me for the equivalent of a metal ion.

Suitable compounds of the Formula VII are, for example: N methyl N 8 chloroethyl aniline, N- ethyl N B chloroethyl m toluidine, N,N-di-B- chloroethylaniline, N cyanoethyl N ,6 chloroethylaniline, N butyl N B chloroethyl aniline, N-butyl- N fi bromoethylaniline, 3 methoxy N methyl-N- fl-chloroethylaniline, 3 chloro-N-butyl N ,6 chloroethylaniline.

Suitable compounds of the General Formula VIII are, for example, the sodium salts of 4-methoxybenzoic acid, 4-ethoxybenzoic acid, Z-ethoxybenzoic acid, S-methoxybenzoic acid, the potassium salt of 2-butoxybenzoic acid, the silver salts of 4-allyloxy-benzoic acid, 4-benzyloxybenzoic acid, 4-phenoxy-benzoic acid, the Cu salts of 3-methoxy-benzoic acid, Z-fi-naphthoxy-benzoic acid, the potassium salt of 2 (carbomethoxy-oxy)-benzoic acid, the sodium salts of 4-(carboethoxy-oxy)-benzoic acid, 4- acetoxy-benzoic acid, the magnesium salt of Z-acetoxybenzoic acid, the lead salt of 4-benzoyloxy-benzoic acid.

Suitable compounds of the General Formula IX are, for example: the sodium salts of hydroquinone-monomethyl ether, resorcinol-monoethyl ether, resorcinolmono B chloroethyl ether, resorcinol mono-cyanoethyl ether, resorcinol monoacetate, hydroquinone-monophenyl ether, pyrocatechol-monomethyl ether, pyrocatechol-monopropyl ether, pyrocatechol-monophenyl ether, pyrocatechol o carboxylic acid ethyl ester, 4-chloropyrocatechol-lor -2-methyl ether, l-hydroxy 4 methoxynaphthalene, l-hydroxy 5 methoxynaphthalene, Z-hydroxy-B-methoxynaphthalene.

The reaction of the Compounds VIII or IX with the compounds of the General Formula W1 is carried out by heating the components for several hours in a suitable solvent, such as, for example, dimethyl formamide, dimethyl sulphoxide, diethylene glycol monomethyl ether.

The metal salts of the compounds of the General Formula VII and IX can also be prepared in an especially advantageous manner by adding the equivalent quantity of a salt to the carboxylic acids or phenols dissolved in the solvents mentioned above.

Methylene compounds of the Formula HI suitable for the production of the new dyestulfs are, for example, malonic acid dinitrile, cyanoacetic acid methyl ester, cyanonacetic acid ethyl ester, cyanoacetic acid butyl ester, cyanoacetamide, cyanoacetomethylamide, cyanoacetodimethylamide, methylsulphonylacetonitrile and phenylsulphonyl-acetonitrile.

As functional derivatives of aldehydes of the Formula II, there can be employed the compounds of the general formula the formula wherein R,, A, B, D, R and m have the above identified meaning and R stands for a carboxylic acid or a sulphonic acid group.

The new dyestuffs (I) are excellently suited for the dyeing and printing of aromatic polyesters, for example these from terephthalic acid and glycol or 1,4-bis-hydroxymethylcyclohexane, or from polycarbonates, for example those, from dimethyl-dihydroxydiphenyl-methane and phosgene, and also for the dyeing of synthetic superpolyamides, polyurethanes and of esters of cellulose, especially cellulose triacetate. The dyeings are distinguished by outstanding fastness to light and very good fastness to washing and sublimation. The dyestuffs are also eminently suitable for dyeing at temperatures above C., and in mixed fabrics of wool and polyester they leave the wool component undyed.

In mixtures with blue dyestuffs of the anthraquinone series the new dyestuffs yield green dyeings of excellent fastness to light on fibre materials of cellulose triacetate.

The dyestuffs are also readily soluble in organic solvents and are suited for the coloring of lacquers, oils and synthetic fibres in the mass, as well as for the dyeing of polystyrene and polyethylene. The dyestuffs are moreover soluble with fibre-forming polymers in organic solvents and can be employed in the usual manner in spin dyeing processes.

In the following examples, which are given for the purposes of illustrating the invention, parts stand for parts by weight.

EXAMPLE 1 68.2 parts of the aldehyde of the formula HaC-HQC and 13.0 parts malonic dinitrile are heated in 400 parts ethanol, with the addition of 2 parts piperidine, for 2 hours under reflux at boiling temperature. Upon cooling the styryl dyestuif of the formula HaC-HzC crystallizes out in the form of yellow crystals which are filtered oif with suction and recrystallized from ethanol with the addition of dimethyl formamide. 62 parts of a dyestufi of melting point 146149 C. are obtained. The product dyes polyester and polyamide fibres and also triacetate rayon in clear greenish yellow shades of very good fastness to light, wet processing and sublimation.

If, instead of malonic dinitrile, the equivalent quantity of cyanoacetic acid methyl ester is used and the operation otherwise carried out in the manner described above, a greenish yellow dyestufi of similar dyeing properties is obtained.

100 parts of a fabric of triacetate rayon are heated in a dye bath with 2 parts of the first-mentioned dyestutfs of the present example, 4 parts Marseilles soap and 4000 parts water for 60 minutes at 98-100 C. A greenish yellow dyeing of very good fastness to light and wet processing is obtained.

The aldehyde required for the synthesis of the dyestuffs is obtained in the following manner:

358 parts N-ethyl-N-13-hydroxyethyl-m toluidine and 228 parts triethylamine are dissolved in 500 parts chlorobenzene, and 383 parts 4-methoxybenzoyl chloride are added dropwise. The temperature rises thereby to 60 C. The product is subsequently heated for 2 hours at 80- 100 C. The precipitated triethylamine hydrochloride is filtered oil with suction and the filtrate worked up by vacuum distillation. There are obtained 468 parts of the oily reaction product, which boils at 200-210" C./ 1.5 mm. Hg.

For formylation the substance is dissolved in 1000 parts chlorobenzene and added dropwise at 50-55 C. to a Vilsmeier mixture of 460 parts phosphorus oxychloride and 220 parts dimethyl formamide. After stirring for 12 hours at this temperature, the reaction mixture is decomposed by the addition of ice water and rendered alkaline with a concentrated sodium hydroxide solution. The rising organic phase is separated from the aqueous phase and the aldehyde isolated after the solvent has been distilled off. 443 parts of a thickly viscous dark-colored oil are obtained.

EXAMPLE 2 73.8 parts of the aldehyde of the formula H;CHIC\ /N CHO H3CCO-COH2CHHC H II O 0 are heated for several hours with 13 parts malonic dinitrile in 400 parts n-butanol in the presence of 2 parts triethylamine, and the dyestuif obtained is precipitated by cooling the reaction mixture.

Yellow crystals of M.P. 76-79" C. are obtained after recrystallization from methanol.

The dyestuif dyes materials of polyesters and polyamide and also of cellulose esters in clear greenish yellow shades of excellent fastness to light, wet processing and sublimation.

100 parts of a fibre materials of polyethylene glycol terephthalate are dyed in a bath which contains 2 parts of this dyestulf and 20 parts of a carrier (cresotic acid ester) in 4000 parts water, first for 15-20 minutes at C., then for 60-90 minutes at boiling temperature. A clear, greenish yellow dyeing of eminent fastness to light, washing and exhaust gas is obtained. The dyeing is furthermore characterized by very good fastness to sublimation.

In order to improve the dispersion, the dyestutf in the form of an aqueous paste, may also be thoroughly mixed with the dispersing agent before the dyeing process and employed, after suitable drying, in the form of a dyestuflt' powder.

If in the preparation of the dyestuff, cyanoacetic acid methylester, cyanoacetamide, cyanoacetic acid benzylamide or methylsulphonyl acetonitrile is used, instead of malonic dinitrile, and the operation is otherwise carried out in the same manner as described above, greenish yellow dyestulfs of similar fastness properties are obtained.

The above-mentioned aldehyde is prepared in the following way:

53.7 parts N-ethyl-N-fi-hydroxyethyl-m-toluidine and 33.4 parts triethylamine are dissolved in 400 parts o-dichlorobenzene and treated dropwise with 65.5 parts p-acetoxybenzoyl chloride. The temperature of the reaction mixture rises to 80 C. and the product is stirred, after the exothermic reaction has subsided, for 2 hours at 80100 C. The solution is then freed from the precipitated triethylamine hydrochloride and formylated at 40- 50 C. by means of a Vilsmeier mixture of phosphorus oxychloride and dimethyl formamide. After the customary working up, the aldehyde is obtained as a thickly viscous liquid which can be employed without further purification for the dyestuff condensation.

EXAMPLE 3 40 parts of the aldehyde of the formula Ego-H2O moiopo-gp-o-nio-nio CH3 0 Q EXAMPLE 4 62.6 parts of the aldehyde of the formula N- CHO 0-HgC-H C OCH:

are condensed in parts ethanol with 13 parts malonic dinitrile in the presence of piperidine. A yellow dyestuif of M.P. -142 C. is thus formed, which draws in very clear greenish yellow shades of fibres of aromatic polyesters and polyamides and on material of triacetate rayon. The dyeings are characterized by excellent fastness to light, wet processing and sublimation.

parts of dyestutr' are mixed with 5000 parts polystyrene and melted in the usual manner under nitrogen at about 200 C. The melt is worked up in the usual manner and gives greenish yellow injection-moulded articles of good fastness properties.

100 parts of a fabric of synthetic superpolyamides are introduced at -40 C. into a dye bath which contains 2 parts of the styryl dyestufif and 2 parts of a condensation product of aromatic sulphonic acids and formaldehyde in 4000 parts water. The temperature is raised to 9698 C. in the course of 20-30 minutes and dyeing is carried out at this temperature for -60 minutes. A fabric dyed greenish yellow with very good fastness to wet processing and good fastness to light is obtained.

For preparation of the aldehyde mentioned above, 62 N-fl-chloroethyl-m-toluidine are heated in the presence of parts resorcinolmonomethyl ether and 99 parts N-ethyl- 28 parts powdered potassium hydroxide in parts diethylene glycol dimethyl ether for 7 hours at C. After the inorganic salts have been removed, the reaction mixture is distilled under vacuum. There are obtained 115 parts of a reaction product boiling at l91-l96 C. at 0.8- 0.9 mm. Hg, which is subsequently converted into the aldehyde by the action of dimethyl formamide and phosphorus oxychloride. The product is obtained as a pale yellow thickly viscous oil which crystallizes after some time.

The following table gives a survey of a series of further valuable dyestulfs which can be prepared by one of the methods described above. Various radicals and indices are referred to the General Formula I.

Shade of the dyestufi on fibres of C aromatic poly- A esters or trim R D Y acetate H H CN Q2)? I CA a Greemsh yellow 0 C C H H COOC H D a on H on n om-c-o-Qgo-om-cm- 0 C H CH CN D0. o.Bt( 10r 1o-oH,cH,-

C H CH) CN D0; cane-@w O-GHr-CHz- C H CH: CN D0; OH;Oll0CH:CHz-- C11 CHI CN D0.- HgC-OCO CO-GHs-CH Same as abov e OH. H 0 ONE: D0.

04 CH: C O 0 Cali D0. HsCz-OCO COCH:CH:

(i ll CH: CH: CN D0. (kHz-O CI 0- fiO-CHrC H:-

' CH1 H CN D0. ("JO-C Hz-CHr- O C H|-0 C 3 (323 C CN D0. cmo-Go-cm-om- 0:11 I CH 0 D0. l I S 206 5 (Ben,

C H CH N D0. o-om-om- C O CH:

(31H; CH] GN D0.

OCHa-CHzOl i mianmonunuea Shade of the dyestuff on fibres ol R10-A --C --B- I aromatic pol esters or trim R D Y acetate 04H; CHI ON Greenish yellow. O-GHa-CHz- 0 CH2CH :C N I v v C:Ht,' CHI C 0 0 CH3 D0. @o-cm-cm- I O C O OH:

' v I Cali: 1: ON Do. OCHr-CH:-; a

O C O CzHl 03s 11 CN Do. BIG 0 O-C Hr-CHP ON Do.

EXAMPLE 55.2 parts of the azomethine of the formula H3C-H2C-HzC-HnC ner indicated above:

HaC-HgC-HaC-HgC C H C O C O CH C 5g g r 1 600B HzC-HgC-HaC-HaC n mco--o-cmom- HrC-HgC-HgC-HaC CaHsE-O-Q-E-O-C Hz-Ca c H=NQ We claim:

1. A dyestufi of the formula:

R10-A-0-B wherein R; is methyl, ethyl, p-chloroethyl, fi-cyanoethyl, acetyl, propyl, phenyl, methoxycarbonyl, or ethoxycarbonyl;

A is phenylene, chlorophenylene, or naphthylene;

B is ethylene;

R is methyl, ethyl, p-chloroethyl, p-cyanoethyl, n-butyl, or

CHaO-Q-O omen,-

A is phenylene or naphthylene; 7 5. The dyestufl" of the formula R is methyl, ethyl, n-butyl or V v W or .7 01H: V. V I CHIO-Q-OCHiCHr- 0CaHZ-N- CH=C\ 5 5 CN v v OHa-- H: v D is hydmgen methyl; and 6'. The dyestufl of the formula Y is cyano, methoxycarbonyl, or phenylsulphonyl. CH CH 1 3. The dyestufi of the formula 15 UNITED STATES PATENTS 4. The dyestulf of the formula 2,583,551 1/1952 Dickey et a1 260-465 2,936,319 5/1960 Marian et a1 260-465 CN 20 LEWIS GO'ITS, Primary Examiner 260-463, 465 E, 473 R, 475 PN, 566 R, 573 

